New structure in the Shapley supercluster

Drinkwater, M. J., Proust, D., Parker, Q. A., Quintana, H. and Slezak, E. (1999) New structure in the Shapley supercluster. Publications of the Astronomical Society of Australia (P A S A), 16 2: 113-123.


Author Drinkwater, M. J.
Proust, D.
Parker, Q. A.
Quintana, H.
Slezak, E.
Title New structure in the Shapley supercluster
Journal name Publications of the Astronomical Society of Australia (P A S A)   Check publisher's open access policy
ISSN 1448-6083
Publication date 1999
Year available 1999
Sub-type Article (original research)
Volume 16
Issue 2
Start page 113
End page 123
Total pages 11
Editor Bryan Gaensler
Place of publication Collingwood, Australia
Publisher C S I R O Publishing
Language eng
Subject 0201 Astronomical and Space Sciences
Abstract We present new radial velocities for 306 bright (R < 16) galaxies in a 77 sq. degree region of the Shapley supercluster measured with the FLAIR-II spectrograph on the UK Schmidt Telescope. The galaxies we measured were uniformly distributed over the survey area in contrast to previous samples which were concentrated in several rich Abell clusters. Most of the galaxies (230) were members of the Shapley supercluster: they trace out two previously unknown sheets of galaxies linking the Abell clusters of the supercluster. In a 44 sq. degree area of the supercluster excluding the Abell clusters, these sheets alone represent an overdensity of a factor of 2.0 +/- 0.2 compared to a uniform galaxy distribution. The supercluster is not flattened in the Declination direction as was suggested in previous papers. Within our survey area the new galaxies contribute an additional 50% to the known contents of the Shapley supercluster with a corresponding increase in its contribution to the motion of the local group.
Keyword Galaxy clusters
Distances and redshifts
Large-scale structure of universe
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Unknown

Document type: Journal Article
Sub-type: Article (original research)
Collection: School of Mathematics and Physics
 
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Created: Fri, 02 Jul 2010, 12:18:43 EST by Ms Susana Macanawai on behalf of Faculty of Science